What is the benefit are draw back of splitting your sets from merged sets?
Split:
Keep only the parents/clones you want, chuck the clones you don't want.
Smaller to upload specific parents/clones (except when you want the one and only clone).
Easier to download any new clones; no need to merge it if you download just the clone, and no need to redownload the parts you already have as you would if deloading a full merged set.
Smallest total size (about same as merged).
Most common found (split) becasue of the above three reasons.
Merged:
Less zip files.
Clones & parents move together in one file; no "lost clones" if you move/delete the parent.
Smallest total size (about same as split).
Non-merged, non-split:
Clones don't need parent zips.